A compound represented by formula (I): (wherein the symbols are the same as defined in the description), a salt thereof, an N-oxide thereof, a solvate thereof or a prodrug thereof, and medicinal use thereof.The compound represented by formula (I) has CXCR4 antagonistic activity. It is hence useful as, e.g., a preventive and/or therapeutic agent for CXCR4-mediated diseases such as inflammatory/immunologic diseases (e.g., rheumatoid arthritis, arthritis, retinopathy, pulmonary fibrosis, and rejection reactions of transplanted organs), allergic diseases, infections diseases (e.g., human immunodeficiency virus infection and acquired immunologic deficiency syndrome), psychoneurotic diseases, cerebral diseases, cardiac/vascular disease, metabolic diseases, cancer diseases (e.g., cancer, cancer metastasis) or as an agent for regeneration therapy.